HomeExpertly
www.homeexpertly.comRebar Calculator — Slab Grid, Lineal Feet, Weight & Bars
Estimate the reinforcing steel for a slab or mat. Enter each slab's dimensions, pick your bar size and spacing, and get bars in each direction, grid ties, lap splices, total lineal feet, steel weight, and the number of stock bars to buy — with a downloadable takeoff PDF. Pairs with the HomeExpertly concrete suite.
Estimates a two-way rebar mat for planning only. Bar size, spacing, cover, and lap length must follow your engineer's design and local code. Confirm before ordering steel.
1
Rebar specification
#3
3/8"
#4
1/2"
#5
5/8"
#6
3/4"
in
6"15"24"
in
Typ. 3" cast against earth
2
Slabs / areas
Type
Length (ft)
Width (ft)
Qty
Enter each rectangular slab. A two-way grid is run both directions at your spacing. Use Qty for identical pours; add L-shapes as separate rectangles.
3
Splices & waste
× Ø
40× is typical
%
0%15%30%
Total stock bars to buy
— bars
Enter your slab and click Calculate
Lineal feet
—
incl. waste
Steel weight
—
lb
Tie points
—
intersections
Bar & grid breakdown
Lengthwise bars—
Widthwise bars—
Bars subtotal—
Grid intersections—
Lap splices—
Lap allowance—
Total (net)—
Total (+ waste)—
Material summary
Lengthwise bars
—
Widthwise bars
—
Tie points
—
Lineal feet
—
Steel weight
—
Total bars
—
Rebar takeoff
| Item | Count | Each | Lineal ft |
|---|---|---|---|
| Run the calculator to see your takeoff | |||
Visualizations
Lineal feet by component